Hoisting apparatus



Au 5, 193m w. SHELDON HOI S TING APPARATUS Filed May 5, 1926 5 Sheets--Sheer. I

INVENTOR' Aug. 1930. w. SHELDON 1,772,370

HOISIING APPARATUS Filed May 5, 1926 3Sheets-Sheep 2 INVEMZOR.

lgaw

Aug. 5, 1930.

w. SHELDON 1,772,370

HOI STING APPARATUS Filed ma 5, 1926 s Sheets- Sheet s INVENTOR.

J dowwwwmv BY 2 ATT'ORNZIA.

Patented" Aug. 5, 1930 PATENT orrlcr.

' fwnnno snnnnon, or soon: NORWALK, connnc'rrcur ,nois'rme ArrAaA'rns Application filed May 5, I This invent wells.

Special objects of the invention areto uti-" lize the best features of rotary drilling methods, combined withthe advantages of pressure feed and to efl'ect this with relatively simple, powerful, readily transportable apparatus, constructed so that it maybe handled substantially as a sin le unit. Other special objects 0 the invention are 'to combine the diiferent units of the appara-- tus in acompact, well balanced structure with the several parts located for their most handy and efli'cient control. and operation, to provide full accessibility for careor removal of the different portions of the apparatus, to provide full flexibilit and varlable speed control particularly 0 the rotary table and hoist mechanism, and in general, to provide a machine of this nature which will be practicalin every way for thepurposes intended. The many novel features of construction,- combinations and relations of parts by which the foregoing and other objects are attained will appear as the specification proceeds.

In the drawings forming part of this specification and to which attention is nowinvlted, some of the numerousv possible embodiments of the invention are illustrated and it is to be understood that other structural modifications and changes may be made without departure from the broad spirit and scope of the invention as hereinafter defined and claimed. Figure 1 is a side elevation of the machine as mounted on parallel beams laid on the transverse beams of a steel derrickfloor.

Figure 2 is substantially a plan view of the same with the intermediate hoist mechanismremoved.

Figure-3 is a broken plan part sectional view showing a modified form of two speed drum and cat head drive and with a selective speed gear box substituted in place of the motor in Figure 2.

Figure 4is a cross sectional view as on substantially the plane of line H of Figure 2 of another modification showing the high speed and low speed clutches in section and s rocket chain drive from these clutches to t e drum.

ion relates to the drilling of oil 1926- Serial 1N0.- 106,849.

Figure 5 is a similar view of the first form 'ofitheinvention, Figures'l and 2,'showing spur gear drive between the clutches and drum and showing internal speed reducing gearingin the drum. I

Figure 6 is a view of the right hand end of the machine shown in Figures 1 and 2.

One of the special features of the invention is the mounting of the various units 'of'the machine, all on a sled like base or frame, made i up of two side sills Lconnected at intervals by crossbraces 2. These sills and cross braces may be I-beams, the cross braces of less depth than the sills (Figure 5), the lower flanges of the sills serving as flat runners and being 5 shownas turned up at the ends at 3 after the manner of 'sled runners.

The motor or transmission gearing is mounted on one end of the frame, the rotary table is mounted on the opposite end, the hoist is ositioned intermediate the two and the hoist and table are driven byline shafting extending from the motor or transmission gearing atone end of the "frame, beneath the hoist, to'the rotary table at the opposite I end.

The motor shown at 4 in Figures 1 and 2 is an especi lly compact rotary cylinder steam engine, but it will be understood that.

internal combustion or electric power may be used in place of the power unit shown. This motor is shown as having outstanding support lugs 5 which may rest upon and be bolted direct to the side sills as in Figure 2, or be mounted on step blocks 6 which in turn 55 are bolted on the side sills as shown in Fig urel.v a l. Where the apparatus is to. be driven from another or outside power source, ay'set of transmission gearing may be substituted in" place of the motor as indicated in Figure 3 where 7 designates a change speed gear box having lateral supports 8 by which it is bolted .on the sills in place of the motor. Extending from the motor, F

2, 01 from the gear box, Figure 3, is the line shafting 9 located substantially centrally of. the frame in suitable bearings 10 mounted on 1 thecrossbraces. Interposed in this shafting l are shown, in the order named, a chain uniigures 1 and versal coupling 11, a main clutch 12 controlled by lever 13, a coupling 14, a rotary table clutch 15 controlled by lever 16 and a coupling 17. The rotary clutch being interposed between the two couplings 14, 17 makes it possible to remove this clutch when necessar without disturbing other parts.

l he rotary table is indicated at .18 and is shown as driven by a bevel pinion 19 on the end of the shaft engaging a bevel gear ring 20 on the under side of the table.

The support for the table is shown as a relatively massive flat and substantially s uare base plate 21 secured by bolts 22 on top of the frame at the end opposite the motor or transmission gearing and carrying a dependent sleeve 23 to serve as a long rlgid bearin for the table.

The drill pipe is shown in the ma1n v1ew at 28, gripped by a special clamp 29 carried by a sleeve 30 Wl'llCh is slidingly keyed in the table at 31. This drive sleeve is raised and lowered to lift the drill pipe or to impart feeding movement thereto by power mechanism shown as an annular cylinder 32 concentrically hung to the lower end of the bear ng sleeve by a clamp structure 33 and containing an annular piston having an upwardly projecting annular piston rod for impartm the lifting and lowering thrust to the rive sleeve.

The power fluid which may be water under pressure is shown as admitted to the upper and lower ends of the power 0 linderthrough piping 38, 39 under control 0 a special valve 40 The hoist mechanism consists of a drum 41 journaled on a shaft 42 which is supported in s-ide'frames 43 mounted on the sills intermediate the opposite ends of the main frame. To drive th1s drum at different speeds, a low speed and a high speed clutch are provided driven from the main shaft and connected to the drum by uitable gearing.

The low speed and-high speed clutches are indicated respectively at 44, 45 in Figures 2, 4 and 5, the low speed clutch in Figure 4 being indicated as of the positive jaw type having interengaging driving and driven jaws 46, 47 and t e high speed clutch being shown "as of the frictional type having engaging clutch plates 48. The teeth of the jaw clutc are shown as having inclined faces 49 adapted to ride over each other to positively disengage this cluteh when the high speed friction clutch takes hold.

These clutches are shown mounted on shafts 50 supported at their inner ends in sockets 51 in the sides of the main shaft bearing 52 and rigidly secured at their outer ends by set screws 53 in brackets 54. This construction enables either one of the clutches being dropped by simply withdrawing the shaft 50 which su ports it.

The i erence in speed of the two clutches site end engaglng a gear ring 90 carrie toengage the clutch gears 55, 57 at opposite sides of their centers. In this way both clutches-are driven in the same direction.

high speed clutches respectively are shown as foot pedals 59, 60, Figure 2, the first operating ashaft 61 carrying an arm 62 engaged with the forked end 63 of a lever'64 pivoted at 65 and having its opposite forked end 66 engagedwith a movably shifting collar 67 of said clutch. The high speed clutch pedal 60 operates a sleeve 68 loose on shaft 61 and carrying .a lever arm 69 connected by link 70 with the clutch shifting lever 71 which is pivoted at 7 2' and engages the shift collar of the 'high speed clutch at 73.

Different forms of gearing may be employed for effecting the drive of the drum from the two different speed clutches. Thus in Figures 1, 2 and 5, the driven members .of the clutchesare shownas carrying surrounding spur gears 74, 7 5' for engagement, the first, with a ring gear 76 carried by a member 77 r0- tatable on the drum shaft and the second engaging a ring gear 78 directly attached to the drum.

In Figure 4 the driven element of the first or low speed clutch is shown as carrying a sprocket pinion 7 9 over which passes a sprocket chain 80 engaging a sprocket gear 81 on the rotatable gearelement 77 and the driven element of the second or high speed clutch is shown as carrying a sprocket pinion 82 over which passes a chain 83 engaging a sprocket gear 84 directly attached to the rim of the drum.

The drum shown in Figures 1, 4 and 5 is of an internal gearing type having a shaft 85 ]ournaled eccentrically, therein, carrying a pinion 86 on one end meshing with a pinion 87 fixed on the sleeve 88 of the rotatable member 77 and carrying a pinion 89 on its oppob a member 91 rotatabl supported on the 0 p0 site end of the drum sl iaft. The outer sur aces of the rotatable gear carrying members 77 and 91 are shown-finished as brake-rings 92, 93 engageable by brake bands 94, 95 so that either or both said members may be held sta- The means for operating the low speed and tionary. These brake bands are indicated in I arms is fixed on shaft 100 which is o erated by a hand lever 101 and the other? is xed on a sleeve 102 rotatable on shaft 100 and actuated by hand lever 103. Thus, by means of hand lever 101, the brake 94 may be set-to relatively slow hold the ear ring 76 and by means of hand lever 103 rake 95 may be set to hold the gear ring 90.

93 i-s to be hel for a continuous period, a

lock pin or dog 104, Figure 5, may be inserted through the adjacent side frame into a seat 105 in the body of the drum. The brake levers may be counterweighted as indicated at 106, Figure 1, so that they will normally stand with brakes released.

' For high speed operation of the hoist shown in Figure 5 the hi h speed clutch is engaged and this being irectly cared to the drum through the spur gearing 5, 78 or the sprocket gearing shown in Figure 4, drives the drum at the desired hi h speed.

The drum is s own in Figures 4 and as having integral brake'rings 107 at opposite ends of the spool adapted to be acted'onby brake bands 1 8 suitabl operated as by means of linka e and hand ever similar to those describ a "The cat head drive isshown in Figure 5 as taken'ofi the low speed ring gear 76 b means of a pinion 109. on the cat head sha 110'. This shaft is journaled on to of the side frames and 'carriesthe cat hea s 111 at o posite ends and a positive jaw clutch is shbwn at 112 for coupling the pinion 109 to this shaft. For operating the cat heads this clutch 112 is engaged, the drum is held stationary by the center brakes 108 and the dogging pin 104; being withdrawn and brake 95.

released, the low speed clutch 44 is thrown in so that the cat heads will be operated without turning the drum. The cat heads may be secured when not in use by movable pawls 113 I engageable with ratchets 114 at the inner sides of the cat heads.

The hoist shown 'in Figure 3 is similar to that described, except that the internal. gears .are omitted and the drum is driven, at low or, high speed by ring gears 1-15, 116 directly attached to the drum and engaged with'the 10w speed'and high speed.

' clutch gears 7 4, 7 5 respectively. In this form of construction the brake rings 107 for'the drum are located at the-ends of the spool. This form of hoist can thus be operated either at low speed or at high speed by directly em gaging the low speed, or

' whichbeing directly'geare to the drum operate the same acc'ordmgl The speed change gear do: 7 shown in Fig 'i h speed clutches,

In the latter instance, with gear ring generally are 3 provides possibility for further speed changes, the same being operated by a hand lever 117 connected with a gear shifting shaft 118 entering the gear box and serving to shift the ears in the usual way. Power is applied to t e entering end of the gear; box by shaftin 119 shown as carrying a sprocket gear 120 driven b sprocket chain 121' from a suitable source 0 power.

The cat head drive in Figure 3 is taken from the main shaft by a sprocket gear 122- on said shaft connecting by chain 123 with sprocket ear-124 on shaft 125 journaled in a bearing racket 126 on top of one ofthe' side frames and carrying bevel gear 127 in mesh with abevel ear 128 on the cat head shaft 110.

, With the orm of hoist shown in Figure 3, I when only the cat head drive is to be used,

the main clutch 12 may be thrown out so that only the cat heads will be driven. This struc} ture has the further advantages of a variety of different drum speeds because in addition to the so-called high and. low speed drives attainable from the high and low speed clutches, other speeds may be had-by utilizing the diflerent gear sets in the change speed gear box. If desired, this gear box may con tain'a set of reverse gears so that the hoist may be reversed without reversing the motor.

-Tl11S is articularly desirable where 'the power is supp ied by an internal combustion-en 'ne. 1 Where steam or electric power is use the reverse-drive is effected by reversing the motor. I

The variety of controls provided-in this invention enable all the usual and special ro-v tary drilling operations being readily performed, with or without the use of the ower feed as well as of the usual and s ecial oisting operations to be effected both y the hoist drum and the-cat heads. The hoist is capable of both fast and slow operation and the two speed clutches enable the change from high to low or from low to highto be uickly effected without injury or shock to t e mechanism.

in position where the driller can readily observe both the operation of the rota action of the hoist and cat heads.

shows also how the controls forthe engine, indicated at 129,130 may be broughtforwardl from the engine to a position adjacent t e'other controls. Thus, without mov may start, sto and reverse the motor, may control the hoist and cat head operation, the

The various controls are-usually located as indicated in Figure 1 ad'acent the hoist and and the l hisview r a 12o ing from this intermediate station the driller operation vofthe rotar table .and the action l of thepower feed'mec anism.

end, provides a close con la compact an wellbalanced structure one linga short drive" The arrangement of the motor at'one end of the frame, the hoist intermediate and the rotary table and power feed 'at'theop fosite shaft from the motor to the hoist and table and provides also a structure which may be readily transported and fits in with the modern derrick structure. Any time that it may be necessary to move the apparatus, the same 7 device may be skidded into place. The ap-' paratus may then be bolted in place'by inverted U-strips engaged over the side sills and bolted at their lower ends to the beams of the derrick floor.

For high speed operation of the drum, such as for repairing the empty block or for lifting out a light line of pipe, the drum may be driven directly from'the cat head shaft by providing a gear on that shaft in-mesh with the gear on the drum and clutch means such as an ordinary jaw clutch operable to couple this extra gear to the cat head shaft, it being understood that when this drive from the cat head shaft is being used, both the lower drum drive clutches will be disengaged.

What is claimed is:

1. Well drilling apparatus comprising line shafting carrying oppositely faced bevel gears, evel gears of different diameters driven at different speeds but in the same direction by said first named gears, different speed clutches operated by the driven bevel gears, hoist mechanism, gearing connecting said clutches with said hoist mechanism and means for arbitrarily controlling the differ-' ent s eed clutches.

2. ell drilling apparatus comprising line shaftin carrying oppositely faced bevel gears, evel gears of different diameters driven at different speeds but in the same direction by said first named gears, different speed clutches operated by the driven bevel gears, hoist mechanism, gearing connecting said clutches with said hoist mechanism and means for arbitrarily controlling the different speed-clutches, the low speed clutch being of the positive jaw type with beveled' faces to permit overrunning of the clutch members and the high speed clutch being of the frictional type.

3. In well drilling apparatus, a hoist drum, a drive shaft, bevel pinions arranged in opposed spaced relation on said drive shaft, bevel gears of different sizes engaged with said pinions and driven thereby in the same direction but at different speeds and gearing from said different speed bevel gears 4. In well drilling apparatus, a hoisting drum, a drive shaft beneath said drum and extending at a right angle to the axis thereof, bevel pinions spaced in opposed relation on said shaft, bevel gears of different size driven by said pinions and mounted beneath the drum with their axes in line and parallel to the drum axis and gearing from said different size gears to the drum including independently operable clutches beneath the drum on the same axes with the different size bevel gears. g

5. In well drilling apparatus, hoist mechanism, a drive shaft, bevel pinions in spaced opposed relation on said shaft, bevel gears of different sizes driven by said pinions in the same direction but at diiferent speeds and independently controllable gearing from said difierent speed gears respectively to the hoist mechanism.

6. In apparatus of the character disclosed, a drive shaft, sections of shafting disposed at right angles thereto, clutches mounted on said sections, gearing for driving said clutches from the drive shaft in the same direction but at different speeds and hoistmechanism operated by said different speed clutches.

7. In apparatus of the character disclosed, a drive shaft, a bearing therefor, supporting shafts at right angles to said drive shaft and supported by the opposite sides of said bear-, ing, clutches on said side shafts, gearing for driving said clutches from the drive shaft at different speeds and hoist mechanism operable from said clutches.

8. In apparatus of the character disclosed, a drive shaft, a main bearing through which the drive shaft extends, supporting seats at opposite sides of said main bearing, supporting brackets in line with said seats, shaft sections rigidly held in said brackets and supported at their inner ends by the seats of the main bearing, gears on said side shafts, hoist mechanism operated by said gears, opposed bevel gears on the drive shaft at opposite sides of the main bearing and bevel gears on the side shafts and in mesh with the bevel gears on the drive shaft.

9. In apparatus of the character disclosed, a drive shaft, a main bearing through which the drive shaft extends, supporting seats at opposite sides of said main bearing, supporting brackets in line with said seats, shaft sections rigidly held in said brackets and supported at their inner ends by the seats of the main bearing, gears on said side shafts, hoist mechanism operated by said gears, opposed bevel gears on the drive shaft at opposite sides of the main bearing, bevel gears on the side shafts and in mesh with the bevel gears on the drive shaft and independently controlled clutches on the side shafts providing couplings between the bevel gears and, hoist drivin gears thereon. I

10. apparatus of the character disclosed, a-drive shaft, a main bearing through which the drive shaft extends, supporting seats at opposite sides of said main bearing, support- -ing brackets in line with said seats, shaft sections rigidly held in said brackets and supported at their inner ends by the seats of the main bearing, gears on said side shafts, hoist mechanism operated by said gears, opposed bevel gears on the drive shaft at opposite sides of the main bearing, bevel gears on-the side shafts andin mesh with the bevel gears on thedrive shaft and independently controlled clutches on the side shafts providing couplings between the bevel gears and hoist driving gears thereon said supporting shafts .bein withdrawable through the outer securing rackets to enable said clutches being dropped between said brackets and the seats of the main bearing. 1

11. In apparatus of the character disclosed, a hoisting drum having two sets of gears for operating the same and means for driving said sets of gears at different speeds comprising line sliafting and two sets of bevel gears of difi'erent speed ratios interposed between the line shafting and drum gears and including spaced bevel pinions on the line shafting faced toward each other and bevel gears faced toward each other but onopposite sides of the line shaftin in the space between the pinions on the shaftin a hoisting drum having two sets of gears for operating the same and means for driving said sets of gears at different speeds com'prising line shafting and two sets of bevel gears of difierent speed ratios interposed between the line shafting and drum gears and including s aced bevel pinions on the line shafting face toward each other and bevel gears faced toward each other but on o posite sides of the line shafting in the space etween the pinions on the shafting, shafting supporting said bevel gears at opposite sides of t e line shafting and the sets of gearing for operatin the drum, including large spur gears on the rum so and spur pinions meshing therewith and mounted onthe side shafting in drivenrelation to the bevel gears.

V 13. In apparatus of the character disclosed, a hoisting drum having two setsof gears for operatin ,the same and means for drivin' said sets 0 gears'atdifierent speeds comprising. line shafting and 'two sets of bevel ears of different speed ratios interposed etween the line shafting and drum gears and including spaced bevel pinions on the line shafting faced towardfeach other and bevel gears faced toward each otherbut on I opposite sides of the line shafting in the ace between the pinions on'the shafting,

s fting supporting said bevel gears at oppo- 12. In apparatus of t e character disclosed,

site sidesof the line shafting and the sets closed, adrive shaft, cross shafts at oppo Site sides of said drive shaft and angularly related thereto, bevel pinions on the drive shaft faced toward eachother and disposed at opposite sides of the axes of the cross shafts, ahoisting drum over the cross shafts, bevel gears supported by the cross shafts each in engagement with one of the bevel pinions on the drive shaft and drive gearing for operating the drum from either of. the bevel gears onthe cross shafts," 15. In apparatus of the character disa closed, a drive shaft. cross shafts at oppo-- site sides of said drive shaft and angularlyc related thereto, bevel pinions on-the drive shaft faced toward each other and disposed at. opposite sides of the axes of the cross shafts, a hoisting drum over the cross shafts, bevel gears supported bythe cross shafts each in engagement with one of the bevelpinions on the drive shaft and drive gearing for'operating the drum from either of the bevel gears on the cross shafts and including independently operable clutches on the cross shafts;

16. In apparatus of the character dis- I closed, a drive shaft, cross shafts'at opposite sides of said drive shaft and angularly re lated thereto, bevel pinions on the drive shaft faced toward each other and disposed at opposite sides of the axes of the cross shafts, a hoisting drum over the cross shafts, bevel gears supported by the cross shafts each in engagementwith one of the bevel pinions on the drive shaft and drive gearing for operating the drum from either of the bevel gears on the cross shafts and including independently operable-clutches on the cross shafts, one of said clutches being'of the frictional type and the other being of the o'sitive jaw type with the overrunning engagement.

17. In apparatus of the character disclosed, a drive shaft, cross shafts at opposite sides of said drive shaft and angularly related thereto, bevel inions on the. drive shaft faced toward eac other and disposed at opposite sides of the axes of the crossshafts, a hoisting drum over the cross shafts, earsjcarried by the heads of said hoisting rum, bevel gears sup-ported by the, cross shafts each in engagement with one of the bevel pinions on the drive shaft and drive gearin for operating the drum from either of the evel gears on the cross shafts and including independently operableclutches on jaws arrange for the cross shafts, and gears operated by said clutches in mesh with the gears at the heads of the hoistin drum. 1

18. In com ination, a hoisting drum, a shaft journaled eccentrically in said drum and extending between the heads of said drum, pinions on the ends of said shaft, a drive pinion concentrically related to the drum and in mesh with the pinion on one end of the shaft aforesaid, a ring gear concentrically related to the drum and engaged by the pinion on the opposite end of said shaft, a brake for holding said ring gear and means for driving the drum independently of the gearing described and including a gear surrounding the ring gear but directly connected with the adfiiacent head of the drum.

19. In combination, a hoisting drum, a shaft journaled eccentrically in said drum and extending between the heads of said drum, pinions on the ends of said-shaft, a drive pinion concentrically related to the drum and'in mesh with the pinion .on one end of the shaft aforesaid, a ring gear concentrically related tothe drum and engaged by the pinion on the opposite end of said shaft, a brake for holding said ring gear, means for driving the drum independently of the gearing described and including a gear surrounding the ring gear but directly connected with the adjacent head of the drum and means for operating the concentric drive pinion, including a gear concentrically related to the opposite head of the drum.

20. In combination, a hoisting drum, a shaft journaled eccentrically in said drum and extending between the heads of said drum, pinions on the ends of said shaft, a drive pinion concentrically related to the drum and in mesh with the pinion on one end of the shaft aforesaid, a ring gear concentrically related to the drum and engaged by the pinion on the opposite end of said shaft, a brake for holding said ring gear, means -'for driving the drum independently of the gearing described and including a gear surrounding the ring gear but directly connected with the adjacent head of the drum, means for operating the concentric drive pinion, including a gear concentrically related to the opposite head of the drum and a brake for said last mentioned gear.

21., In combination, a hoisting drum, a shaft journaled eccentrically in said drum and extending between the heads of said drum, pinions on the ends of said shaft, a drive pinion concentrically related to the drum and in mesh with the pinion on one end of the shaft aforesaid, a ring gear con-f ccntrically related to the drum and engaged by the pinion on the opposite end of said shaft, a brake for holding said ring gear, means for driving the drum independently of the gearing described and including a gear surrounding the ring gear but directly connected with the adjacent head of the drum,

means for operating the concentric drive pinion, including a gear concentrically related to the opposite head of the drum, a brake for said last mentioned gear and a brake acting directly on the drum.

' end of the'drum, a ring gear rotatably mounted on said shaft at the opposite end of the drum, a shaft jou'rnaled eccentrically in the drum, pinions on the opposite ends of said shaft, one in mesh with the driving pinion and the other in mesh with said ring gear, means for operating the driving pinion, means for releasably holding the ring gear, including a brake ring rotatable with the ring gear, a brake band engageable with said brake ring, a brake acting directly on the drum and means for directly driving the drum independently of the gearin described and including a ring gear attached to the head of the drum at the side of. the brake ring.

23; In combination, a supporting shaft, a drum rotatably mounted thereon, a driving pinionrotatably mounted on said shaft at one end of the drum, a ring gear rotatably mounted on said shaft at the opposite end of the drum, a shaft journaled eccentrically in the drum, pinions on the opposite ends of said shaft, one in mesh with the driving pinion and the other in mesh with said ring gear, means for operating the driving pinion,

means for releasably holding the ring gear,

including a brake ring rotatable with the ring Igear, a brake band engageable with said rake ring, a brake acting/directly on the drum and means for directly driving the drum inde endently of the gearing described and inclu a ring gear attached to the head of the rum at the side of the brake ring, a gear-adjacent the opposite head of the drum and directly connected with the driving pinion and a brake ring" attached to and ad'acent said gear.

24. hoist mechanism, a supporting shaft, a hoisting drum journaled on said shaft, a sleeve journaled on said shaft at one end of the drum, a pinion on the inner end of said sleeve, a gear on the outer end of said sleeve, a shaft journaled eccentrically in said drum, a pinion on one end of said shaft in mesh. with the sleeve pinion, a sleeve journaled on the supporting shaft at the opposite end of the drum, a ring gear carried by said last mentioned sleeve, a pinion, on the opposite end of the drum carried shaft in mesh with said ring gear and a gear attached to 'one head of the drum for directly driving .to one end head, a relatively rotatable-concentric gear at the opposite end of the drum, a'concentric pinion operated by said latter gear, a pinion eccentrically journaled in the drum and driven by saidvconcentric pinion, a ring gear concentrically related to the first mentioned head of the drum and an eccentric pinion driven by said first mentioned eccentric pinion and in mesh with said ring gear and driving gearing for the gear which is connected with the head of the drum.

26. In hoisting mechanism, a drum, means for driving said drum at one speed and means for effecting the drive of said drum at a different speed, including a ring gear concentrically arranged at one end of the drum, a pinion journaled eccentrically in the drum in mesh with said ring gear, a concentrically arranged gear for operating said eccentrically mounted pinion and means for releasably holding the ring gear against rotation and including a frictional brake for holding the ring gear for short periods and a positive lock for securing the ring gear for longer periods. 1

27. In hoisting mechanism, a drum, means for driving said drum at one speed and means for eifecting the drive of said drum at a different speed, including a ring gear concentrically arranged at one end of the drum, a pinion journaled eccentrically in the drum in mesh with said ring gear, a concentrically arranged gear for operating said eccentrical- 1y mounted pinion and means for releasably holding the. ring gear against rotation and including a stop sbiftable into holding rela tion with respect to the ring gear'and a brake operative tohold the ring gear when the stop is withdrawn.

28. In hoist mechanism, a hoistingdrum, gearing for directly rotating the same, gearing for indirectly rotating the drum, including a gear concentrically arranged at one end of the drum, a cat head shaft parallel to the axis of the drum, a gear on said cat head shaft for engagement with said indirect drive gear, means for controlling the drive relation between said indirect drum drive gear and said cat head shaft gear and means for holding the drum against rotation when said 'cat head drive is effective.

29. In hoist mechanism, a hoisting drum, a hi h speed drive for said drum, a low speed drive for said drum including a concentrically disposed gear at one end of the drum and rotatable independently of the same, a cat head-shaft adjacent said drum, gearing operable at will to drive said cat head shaft from said low speed drum driving gear and means operable at will to hold the drum against rotation or topermit rotation of the same when the cat head shaft is being driven.

30. A hoisting drum having end heads, concentric drive gears at the'outer sides of said end heads, brake rings at the outer sides of said gears, independently operable brake bands for said brake rings, selectively operable gearing in mesh with the gears at the heads of the drum, connections of different speed ratios between said gears and the drum, brake rings on the drum heads at the inner sides of the gears and brake bands operable on said drum head brake rings.

31. In combination, a hoisting drum having end heads, shafting beneath said hoisting drum substantially parallel with the axis of the drum, bevel gears on said shafting oppositely faced and arranged below the drum in line with the space between said end heads, op'posed bevel pinions on an axis at right angles to the shafting, disposed between said bevel gears and in mesh therewith and drive gearing below the drum extending from said bevel gears to the drum and including gear connections onthe shafting substantially in line with the end heads of the drum.

32. Hoist mechanism comprising in combination a mounting frame, drive means mounted at one end of said frame, a hoisting drum mounted on the frame adjacent said drive means, gearing for operating said drum including drive shafting journalled on the frame and extending from the drive means beneath and beyond the hoisting drum, coup'lings in the portion of said drive shafting extending beyond the drum, a clutch in the drive shafting between said couplings and controlling operation of the shafting extending beyond the hoisting drum, and said couplings enabling said clutch to be dro liOped from the drive shafting without distur ing other parts of the hoist.

In witness whereof, I have hereunto set my hand this 28th day of November, 1925.

WALDO SHELDON. 

